On Sunday, 14 April 2019 at 17:33:51 UTC, Adam D. Ruppe wrote:
That will expand to:
I'm sorry, I skipped a step here. The compiler doesn't look into
the mixin string until after it calls mixin, so technically it
goes:
static foreach ->
mixin("void print" ~ 'A' ~ "(int a) {
writeln(ch, " - ", a);
}
And then, from there, mixin parses it and links in as if you
wrote:
void printA(int a) {
writeln(ch, " - ", a);
}
and then, since it is still in static foreach, the compiler will
do another layer of transforming that `ch` placeholder and we end
up with the final generated code:
void printA(int a) {
writeln('A', " - -", a);
}
In the last post, I skipped that middle step. It doesn't change
anything else, but still it is sometimes helpful to understand
exactly what is actually happening.
But yeah, same result in the end - `ch` becomes the literal
representation of the item being looped over, so 'A', 'B', or 'C'
in the example code.
